Best braking options

Are you saying "why bother" with the Z32 brake upgrade?

I think its more toward why bother re-drilling z32 caliper to better release trapped air

Right, you could modify the caliper, but for the effort, you might as well get a new caliper without the problem…

^This

It is very little effort to go to G-E's or the EVO caliper. Its just a matter of dollars and sense.

Keep in mind that if you convert to the slip-on rotor hubs of the late 87-89 Turbo cars, then any off-the-shelf OEM or aftermaket upgrade from the Z32 through the Z34 and G35/G37 will be a direct bolt-on. This includes the Brembo package from the 350Z and the Akebono 14" setup from the 370Z sport package cars.
For the Akebonos to fit you need the conversion kit to fit a Z32.

Don't forget kits for the S-chassis cars will fit as well.

Some info that may be valid for this discussion.

Rotor Size comparison
Front Disc-------Diameter---Height---Thickness--Min. Thick.--Center Hole
S14----------------10.12-----1.93------0.87--------0.79----------2.68
300ZX TT----------11.02-----2.13------1.18--------1.1-----------2.68
350Z Brembo------12.76-----1.93------1.18--------1.1-----------2.68
370Z Brembo------13.96-----1.95------1.26--------1.18----------2.68
94+ 3KGT VR4-----12.36-----1.79------1.18--------1.12----------2.72
Mustang Cobra----12.99-----1.71------1.1---------1.04----------2.8
Lancer EVO IX-----12.6------1.71------1.26--------1.17---------2.72
Lancer EVO X------13.78-----1.73------1.26--------1.18---------2.72

Additional Reference from Z31.com/wiki

Stock Z31 Brake Information

Basic Info

• SF models are all NAs and all of Canadian origin.
  
• 1984 and 1985 NAs and 1986 SF models are 4 lug. All other models/years are 5 lug.
  
• All year Z31 front brakes are vented.
  
• 1984-1986 rear brakes are solid. All others are vented.
  
• 1987-1989 front turbo brakes are dual piston style. All others are single piston.

Brake Chart

taken verbatim from http://z31.com/wiki/doku.php?id=information:brakes but changed mm to inch.